Boston E+ Green Building Program - 226 - 232 Highland St
226 - 232 Highland St Energy Positive Townhomes
Walls and Roof
Super-Insulated and Airtight Building Envelope
Ceiling/Roof: 14’’ TJI with dense-packed cellulose + R-15 rigid above (R-62)
Wall construction: 12” double 2×4 dense-packed cellulose with Zip system sheathing and Siga taping (R-40)
Windows: Schuco Brand, Low-E, triple paned uPVC windows are utilized. U-value 0.139
Floor Over Basement: 14’’ TJI with dense-packed cellulose + R-15 rigid below (R-62)
Subslab assembly
Unconditioned crawl space with vapor barrier with crush stoned at grade.
Subslab R-value
0.0
Slab edge assembly
NA
Slab edge R-value
0.0
Foundation wall assembly
10" steel reinforced concrete.
Foundation wall R-value
0.0
Above grade wall assembly
12” double 2×4 - 24" OC wood stud wall with Zip system sheathing and Siga taping and fiber cement siding on furring. Wall cavity filled with dense-packed cellulose and interior drywall finish.
Above grade wall R-value
40.0
Flat attic assembly
14’’ TJI with 3/4 plywood sheathing. Cavity filled with dense-packed cellulose and interior drywall finish.
Flat attic R-value
62.0
Cathedral ceiling assembly
14’’ TJI with Zip system sheathing and Siga taping + R-15 rigid above. Cavity filled with dense-packed cellulose and interior drywall finish.
Cathedral ceiling R-value
69.0
Roof Assembly
14’’ TJI with Zip system sheathing and Siga taping + R-15 rigid above. Cavity filled with dense-packed cellulose and plywood sheathing at the underside.
Roof R-value
62.0
Windows and Doors
Window Assembly:
Schuco Brand, Low-E, triple paned uPVC windows.
Door Assembly:
Schuco Brand, Low-E, triple paned uPVC doors.
Average window U-factor
0.14
Solar Heat Gain Coefficient
0.34
Door U-Factor
0.14
Door Area
128 sq ft
Mechanical Systems
Space cooling - Manufacturer & Model
Same system for heating and cooling, Same system for heating and cooling
Space cooling - capacity
3 kW, 3 kW
Space heating - Manufacturer & Model
Mitsubishi H2i Hyperheat MSZ FE09NA/MUZ-FE09NA, 26 SEER, 10 HSPF, Mitsubishi MSZ-GE09NA/MUZ-GE09NA, 21 SEER, 10 HSPF
Space heating - capacity
3 kW
Domestic hot water - Manufacturer & Model
Rheem SolPak RS80-40BP, 40 square foot solar thermal panel (2.4 Solar Energy Factor) with an 80 gallon storage tank for hot water requirement.
Domestic hot water - capacity
80 gal
Ventilation - Manufacturer & Model
Zehnder ComfoAir 350 Heat Recovery Ventilator at (Effective Heat Recovery over 75%).
Lighting Manufacturer and Model
CFL Recessed Lighting and Fixtures
Lighting Efficiency
Mechanical Equipment Installation Details and Comments
Blower Door Test: Infiltration was test at be 0.57 ACH (air change per hour) at 50 Pascals pressure difference. Air flow is allowed to move from the lower floors of the home to the top floor. Upper level windows and a clerestory condition allow for venting excess heat and help to provide more consistent interior temperatures.
Envelope
Air Changes per hour, ACH50
0.57 ACH50
Air Changes per hour, CFM50
Walls and Roof
Super-Insulated and Airtight Building Envelope
Ceiling/Roof: 14’’ TJI with dense-packed cellulose + R-15 rigid above (R-62)
Wall construction: 12” double 2×4 dense-packed cellulose with Zip system sheathing and Siga taping (R-40)
Windows: Schuco Brand, Low-E, triple paned uPVC windows are utilized. U-value 0.139
Floor Over Basement: 14’’ TJI with dense-packed cellulose + R-15 rigid below (R-62)
| Subslab assembly |
Unconditioned crawl space with vapor barrier with crush stoned at grade. |
|---|---|
| Subslab R-value | 0.0 |
| Slab edge assembly |
NA |
| Slab edge R-value | 0.0 |
| Foundation wall assembly |
10" steel reinforced concrete. |
| Foundation wall R-value | 0.0 |
| Above grade wall assembly |
12” double 2×4 - 24" OC wood stud wall with Zip system sheathing and Siga taping and fiber cement siding on furring. Wall cavity filled with dense-packed cellulose and interior drywall finish. |
| Above grade wall R-value | 40.0 |
| Flat attic assembly |
14’’ TJI with 3/4 plywood sheathing. Cavity filled with dense-packed cellulose and interior drywall finish. |
| Flat attic R-value | 62.0 |
| Cathedral ceiling assembly |
14’’ TJI with Zip system sheathing and Siga taping + R-15 rigid above. Cavity filled with dense-packed cellulose and interior drywall finish. |
| Cathedral ceiling R-value | 69.0 |
| Roof Assembly |
14’’ TJI with Zip system sheathing and Siga taping + R-15 rigid above. Cavity filled with dense-packed cellulose and plywood sheathing at the underside. |
| Roof R-value | 62.0 |
Windows and Doors
Window Assembly:
Schuco Brand, Low-E, triple paned uPVC windows.
Door Assembly:
Schuco Brand, Low-E, triple paned uPVC doors.
| Average window U-factor | 0.14 |
|---|---|
| Solar Heat Gain Coefficient | 0.34 |
| Door U-Factor | 0.14 |
| Door Area | 128 sq ft |
Mechanical Systems
| Space cooling - Manufacturer & Model | Same system for heating and cooling, Same system for heating and cooling |
|---|---|
| Space cooling - capacity | 3 kW, 3 kW |
| Space heating - Manufacturer & Model | Mitsubishi H2i Hyperheat MSZ FE09NA/MUZ-FE09NA, 26 SEER, 10 HSPF, Mitsubishi MSZ-GE09NA/MUZ-GE09NA, 21 SEER, 10 HSPF |
| Space heating - capacity | 3 kW |
| Domestic hot water - Manufacturer & Model | Rheem SolPak RS80-40BP, 40 square foot solar thermal panel (2.4 Solar Energy Factor) with an 80 gallon storage tank for hot water requirement. |
| Domestic hot water - capacity | 80 gal |
| Ventilation - Manufacturer & Model | Zehnder ComfoAir 350 Heat Recovery Ventilator at (Effective Heat Recovery over 75%). |
| Lighting Manufacturer and Model | CFL Recessed Lighting and Fixtures |
| Lighting Efficiency | |
| Mechanical Equipment Installation Details and Comments |
Blower Door Test: Infiltration was test at be 0.57 ACH (air change per hour) at 50 Pascals pressure difference. Air flow is allowed to move from the lower floors of the home to the top floor. Upper level windows and a clerestory condition allow for venting excess heat and help to provide more consistent interior temperatures. |
Envelope
| Air Changes per hour, ACH50 | 0.57 ACH50 |
|---|---|
| Air Changes per hour, CFM50 |